Analog Devices Inc. AD7492ARU

Overview

AD7492ARU from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with internal 2.5 V reference and on-chip clock oscillator, operating from a single 2.7 V to 5.25 V supply. It features no pipeline delay, 70 dB typical SNR at 100 kHz input, and 880 ns conversion time - used in high-speed data acquisition systems requiring precise timing control and low-power operation.

For engineers reviewing the AD7492ARU datasheet, AD7492ARU pinout, AD7492ARU application, or AD7492ARU equivalent, this page delivers verified technical context, real-world interface behavior, sleep-mode power management trade-offs, and validated alternative options for industrial sensor interfaces, motor control feedback loops, and portable instrumentation designs.

Technical Context

The AD7492ARU implements a capacitive DAC-based SAR architecture with track/hold acquisition time of 120 ns minimum and aperture jitter of 15 ps typical. Its CONVST-triggered sampling initiates conversion on the falling edge, with BUSY signaling completion after 880 ns - enabling deterministic timing without latency uncertainty.

Digital interface flexibility is achieved via VDRIVE (2.7 V–5.25 V), which independently sets logic thresholds and output drive levels, allowing seamless interfacing with 3 V microcontrollers while AVDD/DVDD run at 5 V for optimal analog performance. Sleep mode selection (partial/full) is hardware-controlled by PS/FS, with full-sleep current as low as 1 μA.

Key Specifications

Pinout & Package

AD7492ARU is housed in a 24-lead TSSOP package (RoHS-compliant, body width 4.4 mm), optimized for compact PCB layouts and thermal performance (θJA = 115°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit parallel SAR ADC applications.

Compared with AD7492ARU, AD7492BRU offers enhanced DC accuracy without interface or power changes, while ADS7822U trades speed and integration for smaller footprint and simpler routing - making it viable only when 1 MSPS parallel throughput is unnecessary.

Availability

AD7492ARU is available at Aetrix Electronics and suitable for industrial sensor interfaces, motor control feedback systems, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for AD7492ARU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7492 product line delivers high-speed, low-power SAR ADCs optimized for precision data acquisition in industrial automation, medical instrumentation, and test & measurement - emphasizing deterministic timing, integrated references, and flexible power management.

FAQ

What is the maximum sampling rate supported by the AD7492ARU?

The AD7492ARU supports a maximum throughput rate of 1 MSPS under specified conditions (VDD = 2.7 V to 5.25 V, TA = −40°C to +85°C). This corresponds to a fixed conversion time of 880 ns plus 120 ns minimum acquisition time. The part achieves this rate using its internal clock oscillator - no external clock source is required for basic operation. At 1 MSPS, typical power dissipation is 15 mW with a 5 V supply.

Does the AD7492ARU require an external reference voltage?

No, the AD7492ARU does not require an external reference voltage. It integrates a precision 2.5 V reference with ±1.5% initial accuracy over temperature, available at the REF OUT pin. This internal reference sets the full-scale analog input range (0 V to 2.5 V on VIN). The REF OUT pin can also serve as a stable reference for external circuitry, reducing component count and improving system-level accuracy consistency.

How does the PS/FS pin affect power consumption in the AD7492ARU?

The PS/FS pin on the AD7492ARU selects between two hardware-defined sleep modes: tying PS/FS high enables partial sleep (250 µA max current), retaining internal reference and oscillator; tying it low enables full sleep (1 µA max), powering down all analog blocks. Both modes activate automatically when CONVST remains low after conversion completes. Wake-up times are 203 µs (partial) and 500 µs (full), directly impacting low-duty-cycle system power budgets.

Can the AD7492ARU interface directly with a 3 V microcontroller?

Yes, the AD7492ARU can interface directly with a 3 V microcontroller using its VDRIVE pin. By applying 3 V to VDRIVE, the logic thresholds (VINH/VINL) and output high voltage (VOH) are scaled accordingly - ensuring reliable communication without level shifters. Meanwhile, AVDD and DVDD may remain at 5 V to preserve analog performance (SNR, THD), demonstrating true mixed-voltage I/O capability confirmed in the AD7492ARU datasheet timing tables.

What is the significance of "no pipeline delay" in the AD7492ARU?

"No pipeline delay" means the AD7492ARU is a true successive approximation register (SAR) ADC - not a pipelined or sigma-delta architecture. Each conversion result corresponds deterministically to the analog sample captured at the falling edge of CONVST, with no additional latency cycles or output staging. This guarantees that the digital output reflects the exact sampled instant, enabling precise time-critical applications like motor control commutation or synchronized multi-channel acquisition without timing compensation.